Workaround server-side reboot test issue with Chromium OS

src/third_party/autotest/files/server/hosts/abstract_ssh.py

 import os, time, types, socket, shutil, glob, logging, traceback
 from autotest_lib.client.common_lib import error, logging_manager
 from autotest_lib.server import utils, autotest
 from autotest_lib.server.hosts import remote
 
 
 def make_ssh_command(user="root", port=22, opts='', connect_timeout=30):
     base_command = ("/usr/bin/ssh -a -q -x %s -o BatchMode=yes "
                     "-o ConnectTimeout=%d -o ServerAliveInterval=300 "
                     "-l %s -p %d")
@@ skipping 277 matching lines @@
                     utils.run(scp)
                 except error.CmdError, e:
                     raise error.AutoservRunError(e.args[0], e.args[1])
 
         self.run('find "%s" -type d -print0 | xargs -0r chmod o+rx' % dest)
         self.run('find "%s" -type f -print0 | xargs -0r chmod o+r' % dest)
         if self.target_file_owner:
             self.run('chown -R %s %s' % (self.target_file_owner, dest))
 
 
-    def ssh_ping(self, timeout=60):
+    def ssh_ping(self, timeout=5):
+        """
+        TODO(petkov): decreased default timeout from 60 to 5 seconds
+        to ensure that wait_down works correctly on Chromium OS. Don't
+        upstream this change assuming the right fix gets implemented.
+        """
         try:
             self.run("true", timeout=timeout, connect_timeout=timeout)
         except error.AutoservSSHTimeout:
             msg = "Host (ssh) verify timed out (timeout = %d)" % timeout
             raise error.AutoservSSHTimeout(msg)
         except error.AutoservSshPermissionDeniedError:
             #let AutoservSshPermissionDeniedError be visible to the callers
             raise
         except error.AutoservRunError, e:
             # convert the generic AutoservRunError into something more
@@ skipping 109 matching lines @@
             autodir = autotest._get_autodir(self)
             if autodir:
                 self.check_diskspace(autodir,
                                      self.AUTOTEST_GB_DISKSPACE_REQUIRED)
         except error.AutoservHostError:
             raise           # only want to raise if it's a space issue
         except Exception:
             # autotest dir may not exist, etc. ignore
             logging.debug('autodir space check exception, this is probably '
                           'safe to ignore\n' + traceback.format_exc())